diff --git a/src/Adapter/MSTest.TestAdapter/Extensions/ExceptionExtensions.cs b/src/Adapter/MSTest.TestAdapter/Extensions/ExceptionExtensions.cs
index 67d14e8b73..318320906b 100644
--- a/src/Adapter/MSTest.TestAdapter/Extensions/ExceptionExtensions.cs
+++ b/src/Adapter/MSTest.TestAdapter/Extensions/ExceptionExtensions.cs
@@ -41,7 +41,7 @@ internal static Exception GetRealException(this Exception exception)
     /// </summary>
     /// <param name="exception">An <see cref="Exception"/> object.</param>
     /// <returns>Exception message.</returns>
-    internal static string TryGetMessage(this Exception exception)
+    internal static string TryGetMessage(this Exception? exception)
     {
         if (exception == null)
         {